California Cities Starting with "O"

California has 10 incorporated cities beginning with "O," ranging from major metropolitan centers to small agricultural communities:

1. Oakdale (Stanislaus County) – "Cowboy Capital of the World," gateway to Sierra foothills
2. Oakland (Alameda County) – 3rd largest in Bay Area, major port, diverse culture
3. Oceanside (San Diego County) – Coastal city, Camp Pendleton, pier, harbor
4. Ojai (Ventura County) – Artistic mountain valley, spas, "pink moment" sunsets
5. Ontario (San Bernardino County) – Inland Empire hub, major airport (ONT), logistics
6. Orange (Orange County) – Historic plaza, Chapman University, Old Towne district
7. Orinda (Contra Costa County) – Affluent East Bay suburb, theater, open space
8. Orosi (Tulare County) – Small Central Valley agricultural community
9. Oroville (Butte County) – Feather River, Lake Oroville, gold rush history
10. Oxnard (Ventura County) – Largest in county, agriculture, beaches, Channel Islands harbor

Notable Unincorporated "O" Communities

• Oak Park (Ventura County)
• Oak View (Ventura County)
• Old Fig Garden (Fresno County)
• Olivenhain (San Diego County)

Data based on California incorporated municipalities. Census-designated places (CDPs) not included.